github.com/google/osv-scalibr@v0.4.1/semantic/version-hackage.go (about)

     1  // Copyright 2025 Google LLC
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //      http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package semantic
    16  
    17  import (
    18  	"fmt"
    19  	"strings"
    20  )
    21  
    22  type hackageVersion struct {
    23  	semverLikeVersion
    24  }
    25  
    26  func (v hackageVersion) compare(w hackageVersion) int {
    27  	if diff := v.Components.Cmp(w.Components); diff != 0 {
    28  		return diff
    29  	}
    30  
    31  	return compareBuildComponents(strings.ToLower(v.Build), strings.ToLower(w.Build))
    32  }
    33  
    34  func (v hackageVersion) CompareStr(str string) (int, error) {
    35  	w, err := parseHackageVersion(str)
    36  
    37  	if err != nil {
    38  		return 0, err
    39  	}
    40  
    41  	if diff := v.compare(w); diff != 0 {
    42  		return diff, nil
    43  	}
    44  
    45  	if len(v.Components) > len(w.Components) {
    46  		return +1, nil
    47  	}
    48  	if len(v.Components) < len(w.Components) {
    49  		return -1, nil
    50  	}
    51  
    52  	return 0, nil
    53  }
    54  
    55  func parseHackageVersion(str string) (hackageVersion, error) {
    56  	v := hackageVersion{parseSemverLikeVersion(str, -1)}
    57  
    58  	// this is technically possible since we're using the "semver-like" parser
    59  	if v.Build != "" {
    60  		return hackageVersion{}, fmt.Errorf("%w: Hackage versions cannot contain a build version", ErrInvalidVersion)
    61  	}
    62  
    63  	return v, nil
    64  }